Quick answer: an egg bound chicken has an egg stuck in her oviduct or vent, and she will stand upright like a penguin, strain or pump her tail, and sit in the nest for hours without laying. Move her to a warm, quiet, dark crate, give her calcium, lubricate her vent and recheck in 2 to 3 hours; if the egg has not passed, she has danger signs, or you can see a broken egg or prolapse, call a vet.
Egg binding is one of the few backyard chicken problems where the clock really matters. Most hens that strain in the nest are just taking their time, but a truly stuck egg can turn serious within a day, so here is exactly what to look for, what to try at home and when to stop and get help.
What Is an Egg Bound Chicken?
Egg binding (vets call it dystocia) means a hen cannot pass an egg that has formed and is ready to be laid. An egg normally takes about 24 to 26 hours to form and only a minute or two to lay. When it gets stuck, usually low in the oviduct or right at the vent, it presses on her intestines, kidneys and the nerves to her legs. Droppings back up, she cannot walk well and she can go into shock.
The Merck Veterinary Manual notes that egg-bound birds “often present as emergencies.” Caught early, many hens pass the egg with simple support. Left for a day or more, it can kill her, and small hens and bantams can go downhill in a matter of hours.
Egg Bound Chicken Symptoms
These are the signs I watch for. One on its own (like a long nest visit) is not cause for panic, but two or three together, in a hen who normally lays without fuss, is a strong clue.
| Sign | What it looks like | How worried to be |
|---|---|---|
| Penguin stance | Standing very upright with legs wide, tail pointing down | High, classic egg binding sign |
| Straining or tail pumping | Tail bobbing up and down, pushing as if laying, with nothing coming out | High |
| Hours in the nest | Sitting in or going back to the nest box over and over, no egg | Moderate on its own |
| Lethargy | Fluffed up, eyes half closed, standing apart from the flock | Moderate to high |
| Not eating or drinking | Ignores treats she normally loves | Moderate to high |
| No droppings, or only watery ones | The egg is blocking her vent | High |
| Swollen, firm belly | Rounded lower abdomen between the legs | High |
| Walking oddly or lame | Wobbling, sitting down, or unable to stand as the egg presses on leg nerves | Emergency |
| Labored breathing, pale or purple comb | Open-mouth breathing, comb losing color | Emergency |
Several of these signs also show up with other illnesses, so it is worth checking our list of signs your chickens are sick if the picture does not quite fit.
How Do You Know if a Chicken Is Egg Bound?
The simplest check is a gentle look and feel. Put on a disposable glove and lubricate one finger with a water-based lubricant or petroleum jelly. Hold her wrapped in a towel, or have a helper hold her, with her vent toward you.
- Look first. Sometimes you can see the shell just inside the vent when she pushes.
- Gently feel her lower belly between the legs. An egg feels like a smooth, hard lump.
- If needed, slide your lubricated fingertip no more than an inch or so into the vent. With an egg-bound hen you will usually feel the shell right there.
Be slow and gentle, and stop if she is distressed or you feel anything other than a smooth shell. Not feeling an egg does not rule it out. Soft-shelled and shell-less eggs are hard to feel, and the egg may be higher up, which is why vets use X-rays or ultrasound to confirm.
How to Help an Egg Bound Chicken at Home
If she is still alert, standing and breathing normally, these steps are worth trying while you line up a vet just in case. Most of the work is warmth, calcium and quiet.
1. Move her somewhere warm, quiet and dim
Put her in a dog crate or large box lined with a towel, in a warm room away from the flock, kids and pets. Cover part of the crate with a sheet so it is dark. Stress makes egg binding worse, and a calm hen relaxes her muscles. Leave water nearby; adding poultry electrolytes can help if she has stopped drinking.
2. Give her calcium
Calcium is what powers the muscle contractions that push the egg out, and low calcium is one of the main causes of egg binding. Give a calcium supplement by mouth, such as a liquid poultry calcium product or a calcium carbonate antacid tablet crushed into a little wet feed, and follow the product label or your vet’s advice for the amount. If she will not eat, ask your vet before dropping anything into her beak. Vets can give injectable calcium, which works faster.
3. Try a warm soak (optional)
Many backyard keepers give a warm Epsom salt soak. Fill a tub or sink with water that feels comfortably warm on your wrist, deep enough to cover her vent and lower belly, stir in a handful of Epsom salt, and let her sit for 15 to 20 minutes while you hold her gently. The warmth relaxes the vent muscles. Dry her well with a towel and a hair dryer on low so she does not get chilled. Some poultry vets point out that a soak can stress a sick hen, so skip it if she panics or seems weak; warmth from the crate does much of the same job.
4. Lubricate the vent
With a gloved finger, apply a water-based lubricant or petroleum jelly around and just inside the vent. This helps the egg slide out if it is sitting right at the opening.
5. Leave her alone and recheck
Give her 2 to 3 hours of peace, then check. If she has laid, keep her in the crate for the rest of the day with food, water and calcium, and watch for a second stuck egg the next day. If nothing has happened, you can repeat the warmth and lubrication once, but do not keep going round in circles. A hen who still has not passed the egg after several hours, or who is getting weaker, needs a vet. Most sources agree you should never let it go past 24 hours.
When to Call a Vet
Call a vet (ideally one who sees poultry or birds) straight away, without trying home care first, if you see any of these:
- The egg has broken inside her, or you can see shell fragments.
- Pink or red tissue is bulging out of the vent (prolapse).
- She cannot stand, is gasping or open-mouth breathing, or her comb has gone pale, purple or dark.
- She is a bantam or very small hen and is already lethargic.
- Home care has not worked after a few hours, or she is getting worse.
A vet can give fluids, injectable calcium and pain relief, use medication to help the oviduct contract, take an X-ray, or remove the egg safely under sedation, sometimes by drawing out the contents with a needle so the shell can collapse. In severe or repeat cases surgery may be needed. According to VCA Animal Hospitals, early treatment often resolves the problem easily, which is the best argument for calling sooner rather than later.
What Not to Do
- Never break or crush the egg inside her. Sharp shell can tear the oviduct, and leftover egg can cause a deadly infection. Collapsing an egg is a job for a vet with the right tools.
- Do not squeeze or press hard on her belly. Rough pressure can rupture the oviduct.
- Do not pull on a visible egg. Let lubrication and her own contractions do the work.
- Do not give human medications (other than a plain calcium supplement) or try to induce laying with drugs at home. Those carry real risks and belong with a vet.
- Do not leave her in the flock. Other hens may peck at her vent.
What Causes a Chicken to Become Egg Bound?
| Cause | Why it leads to egg binding |
|---|---|
| Calcium deficiency | Weak contractions and thin or soft shells that do not move along properly |
| Oversized or double-yolk eggs | The egg is simply too big to pass |
| Young pullets just starting to lay | The reproductive tract is still small and inexperienced |
| Obesity | Fat around the oviduct and weak muscles, often from too many treats or scratch grains |
| Stress | Predators, moving, bullying or overcrowding can make a hen hold an egg |
| Heavy laying or extra lighting | High-production breeds and hens under artificial light lay more and wear down calcium reserves |
| Infection or damage to the oviduct | Swelling or scarring narrows the passage |
| Vitamin D, E or selenium deficiency | These are needed to use calcium and for normal muscle function |
| No suitable nest box | Some hens will hold an egg rather than lay it somewhere they do not feel safe |
Egg Binding vs Vent Prolapse vs Internal Laying vs Broody
These four get mixed up all the time, because all of them involve a hen hanging around the nest or acting off. Here is how I tell them apart.
| Egg binding | Vent prolapse | Internal laying | Broody hen | |
|---|---|---|---|---|
| What is happening | An egg is stuck in the oviduct or vent | Tissue from the vent or oviduct pushes out of the body | Yolk drops into the abdomen instead of the oviduct, often causing infection (egg yolk peritonitis) | Hormones tell her to sit on eggs and hatch them |
| Posture | Upright penguin stance, straining, tail pumping | Straining; pink or red tissue visible at the vent | Upright, waddling, swollen belly that can feel squishy | Flattened in the nest, puffed up |
| In the nest | Restless, in and out, pushing | Sometimes | May sit in the nest but lays no eggs | Glued to the nest, growls and pecks if disturbed |
| Droppings | Few or none | May be messy around the vent | Often normal at first, then off | Rare, huge, smelly droppings once a day |
| How fast it turns serious | Hours to a day | Hours, as exposed tissue dries out | Days to weeks, often chronic | Not an illness |
| What to do | Home care, vet if no egg in a few hours | Clean, keep moist, keep away from the flock, vet | Vet | Let her hatch or gently break the broody spell |
Egg binding and prolapse often go together, because all that straining can push tissue out. If you are dealing with a broody, our guide to caring for a broody hen covers what to expect.
How to Prevent Egg Binding
- Feed a complete layer feed as at least 90 percent of the diet once hens start laying, and keep treats and scratch to a small handful.
- Offer free-choice oyster shell in a separate dish so each hen can take what she needs. Our post on whether chickens need oyster shell explains why it matters.
- Do not rush pullets into lay. Skip extra lighting for young birds and keep them on grower feed until they are close to laying.
- Keep hens moving. Room to roam, scratch and forage keeps them fit and lean.
- Provide enough nest boxes, about one for every 4 hens, in a dim, private spot.
- Cut down on stress from predators, bullying and overcrowding.
- Watch repeat offenders. A hen who has been egg bound once is more likely to do it again, so talk to your vet about her.
Remember that a hen who suddenly stops laying is not necessarily egg bound. Molting, shorter days and age are far more common, and our list of reasons why hens stop laying eggs covers them. For what normal laying looks and feels like, see is it painful for chickens to lay eggs.
Keep reading
- Nesting Box Dimensions for Chickens: Size, Height and How Many
- Chicken Mite Treatment: How to Get Rid of Mites on Chickens and in the Coop
- Is It Painful For Chickens To Lay Eggs?
- 13 Signs Your Chickens Are Sick
- 15 Reasons Why Hens Stop Laying Eggs
- Do Chickens Need Oyster Shell?
- Chickens in Shock: Signs, First Aid and When to Call a Vet
- What Is A Broody Hen?
Frequently Asked Questions
How long can a chicken be egg bound before it dies?
It varies, but an egg bound hen can die within a day or two, and small hens and bantams can go downhill in a few hours. If home care has not worked within a few hours, or she gets weaker, call a vet. Do not let it go past 24 hours.
Can an egg bound chicken still poop?
Often not, or only a little. The stuck egg presses on the vent and blocks droppings, so a hen with few or no droppings plus straining is a strong sign of egg binding.
Will an egg bound chicken eat and drink?
Usually she stops eating and may stop drinking. Offer water with poultry electrolytes and a little wet feed with calcium, but do not force food or water into her beak without a vet’s advice.
Does a warm bath help an egg bound chicken?
A 15 to 20 minute warm soak with Epsom salt can relax the vent muscles and many keepers find it helps. Some poultry vets warn it stresses sick hens, so skip it if she panics or is weak and rely on a warm, quiet crate instead.
How much calcium do you give an egg bound chicken?
Give an oral calcium supplement, such as liquid poultry calcium or a crushed calcium carbonate tablet in wet feed, following the product label or your vet. A vet can give injectable calcium, which works faster.
Can a chicken pass an egg bound egg on her own?
Yes, many hens pass the egg on their own with warmth, calcium, lubrication and quiet, especially if the problem is caught early. If she has not passed it within a few hours, she needs a vet.
What does an egg bound chicken look like?
She stands very upright like a penguin with her tail down, strains or pumps her tail, sits in the nest for hours with no egg, and looks fluffed up and dull. Her belly may be swollen and she may wobble when walking.
Is egg binding contagious?
No. Egg binding is not an infection and cannot spread between hens. If several hens are affected, look at shared causes like diet, calcium, lighting or stress.
